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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1d79665bdd7da381471b0e7562d259ec93d0627b0441406b7ebe9f1041b0dd' 
  AND token = 'bAGQ7wyuHzAZk/CTTn7Bp5IFi94uhwru15AlKCM4L7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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