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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53a2d1cf313de6db779a5da25d09f6037c8edc39ad14e3c610b42253f1565ca' 
  AND token = 'aJjD0tu5pK9lijUjeZLdGKD0Tjk05Uk5CwKYybibkcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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