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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7a45ed41a2f63df7fecf1e3384470f45f6d3ebfc5c98a4f12514cf0b162c81' 
  AND token = 'MXc9bzIdDXNGVTAUyZ50APiqC0xSJklArXM4tph9ccs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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