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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c7db4b0b2f3663370d216aeba2fc0c12d15cea305316a3a2ea4335b915261b' 
  AND token = 'EISyhHJT3QTCU5660vUSMJkUNH0jlIIm2NVeOz9tIOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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