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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbdc5333559345dca5f858ac4130a8f99d778ec9626c88a4b6d241f81148602' 
  AND token = 'zDkn9PJib7Dej4JPu1gkLlAtO6iRUM0/YCBpDf7EUZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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