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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db961d0ef632c3e826c723bc9b226eea5bb17bca175abdf7a998b25cca9aa78' 
  AND token = '8xw0ChlrUxLp8Qiuh9kb9mXfzZPrRARCQaAu9QIHRts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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