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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17cf3482e4eaf87936c1c1376d43c610fc0dac69ec73c7493402ae0c14f7696' 
  AND token = 'SGwQT3cngeTj6QFqwE1hoSmY9OUyz6t2zhEIs5M3zRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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