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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b70290a704634b1be77d44fc7b8233038ae0d369169886168f1935fdc1e3791' 
  AND token = 'TiA7qpcULNYmPbFd17flD9d8jxMEuLA9Tehl/qK6G8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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