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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2b2d47410143f1160fb517c736c705e7163cd5f3259a5f5c6fb94660e02ad6' 
  AND token = 'vfrxi3mtlIKmWZomDwTJ5D0aj6ni11NJbtaP7e5wfQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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