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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d054f70d7ed75df08c5f9f8614dfb2149167f103b5ea503f6a8011f74b70b0' 
  AND token = 's/lVJ+AsaHRzw7cGeD9VwR9GO66eL4Z8dLdsuZSyQVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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