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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ccf293f2157e7e30c00be3a31a0779c1a7a4a9d88b0ab9ec3b4a258fe5c8e2' 
  AND token = 'GQ3/52m5b9TPeT1Yi0wjzbmXns/NYtgOfIUxOOfplno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00437

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}