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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1305ab9716830b8f7ed471ef7325a3df7f127187c5b1b0a28f18ca21e2f942b' 
  AND token = 'LYW3WOcqVRkBtjhm6HNmaftqMhuYZJHADKF07jYfrJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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