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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaae9191c71cb6b214652108b46c939517a53a5111c4d3e5726c21d1778eeb4a' 
  AND token = '/tnSM8y9ksiIaTQhLmz1RDUyc9VOAamXvRZ5GN2Wnb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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