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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa033894e36f46c3ffd5c06488c641383c2e703bac073db282f2627a6b3cdb05' 
  AND token = 'mrcQrrvth/Kd7KneiCfMwF9YtXqPT/SiAyfsDtRm49E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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