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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77c6c59acf447c46cf93bfa65c49c74fcfb45b93b00ccf68678db9d26985e76' 
  AND token = 'shSgMSIvvUnDmz8SBWR1LFf+0YvUy3tuUf9HZaSywZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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