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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f594f2456bbbe70012f68805dff536eb3b00ccf2b23fe08a87e864451c62855' 
  AND token = '6QlC97c/SOHy+VeABZXLjTHEKHUsYe/Ky5a/VZkUbKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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