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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884ad4cb65239c6ad1fe618c3daf92f7bc3e4b1de89be1bf38cc3b09208e80af' 
  AND token = 'isAQGxFrcxVQHfvRyx2vCrDscLkpA94hT0CQqs/LSj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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