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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd972f573783b95bdfbed4d74db3bdff003d2d19d62c1fabd5244ef27ccf9c16e' 
  AND token = 'c3BrjCDkakinr/X1DmjT9nJeCsQi1ja5se66LNvRcfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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