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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a3982d75caff67b7a7082435d95cc8ce1221ecfe58626e26a947735c5b0a0e' 
  AND token = 'KDW6ivQo9khuP4EDDsDpkAulrMPx2vMSVXut5BmobRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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