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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d054ac32eef578b38a98b8ef0c5dbe991035fcf604ed6b64d2c0513e9eb7e7' 
  AND token = 'UMK995rH1arqHmhKeZlR5fghQtw/T3CAuP1Z2utllmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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