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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbeef3baf27b6f56f258ed20e0c948befed7c8109dcd04a328474afa3f696bf' 
  AND token = 'aoH0AqBWw+fW75AKIAHNCetgw4VDTVk3Y4PNb7GXoU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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