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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a1a6ddb0577b982f25d0baa990abb484c9ec910ffb12dfe9f7d74bf9be799d' 
  AND token = 'CLEtFya/TUw4wkTZmNgjmum4HAnTCeZXdJ5w/YilHAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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