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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493a9a08d2f33ab79e79b4ad6ffee1cad3ad3fbbe41ba80f6dc22d3c1ccf2d7c' 
  AND token = 'SDtMBk5SYCmfXxr9qI3S56vNJaBaIfh5d1DaQVLDFrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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