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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c848058c7e62501312e150d2d23d30f20a866fc57e9497359a2b9e84f2c6b5e8' 
  AND token = 'yT4laqP04JMAtxOXKUpha7HF20qy1Mw3PeZvqtMfHAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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