SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d28a14d94c6673f278fb02f71864ca00f138ce9264634bef954a0cffc4633c' 
  AND token = 'KVmZE6sNqewOSGjhVfcZgCf4hXzIhWp2l/MHCSXbMgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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