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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ecea39d41e212fd4b078a79c4193c7b9c86557fac75bb1c36026368995bbf1' 
  AND token = 'quLRSc1yZlFkmKADncYonZ8VHT8uE07U0VZqwXYUET0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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