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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a11cf6e823fbf05cc754e9e83d1138b1b587c675f92488756d8a062d2d640e' 
  AND token = 'A8OcnzSG8FwTLX9hPRQcigNdOIheRwg9oJV9+jf5hgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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