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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a67d14f9a8569611e3690ecfa586ce3049a8a6eeebbc61e7ddbe7afb9e33c2' 
  AND token = 'BjgpQ+JulIWwue73kXeVlqoQV/qasO7SXmMBua9J8O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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