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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ee0a31ca8b3c59f05b2538d7505222ebdc51b9018e4503177e4b07b8468cf0' 
  AND token = 'fSjiBmNBApKDJIUzbB2Ueu4RQk+70ZLLaEmJDPsdubA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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