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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b7d778fd72abb8ddff6e012fbc7b794042c61135f05b445e097a5bb94f0a8e' 
  AND token = '2wd9RG7ozU9ENStDkXGsMtgz6yy7PFAJtBT5/5z1/W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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