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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abaf5a54de86e5c34d0596f2b1bd08c2c892105831073638ccabf3711d2f3aa' 
  AND token = '2uGkxroAAsqSiAB6yauTv8hrhhbwxAXcsRd85YmhySc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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