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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e2ef9654af908c78b54ef98e7933c42ccf3c5c7c5c03e3cf241415b3f4d0d5' 
  AND token = 'Z3/3uXrlZkMmbz4pRPSDhd1s+CSiyUWFzhaIf8U5k3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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