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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be26db3f736212e5e977978dbfe562651b2125bedd9f342ee1dd224bed760a6e' 
  AND token = 'FRm0LGwFUa1/sJ+zABCPwm1sfV106UyZvyyZ1Dj/jGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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