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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bd0ff7b8ecaa34b6c853bc97df243484a34b4a4e7b9b1617ac240914b1a845' 
  AND token = 'ZkOQdOQf6fcljjgYqeBmpOnXcnAPQQAAYixxq20J3cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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