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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c325612c5a35b17a5963dc2b8934ee17b7bed686582ea337f1d654fce62c13ff' 
  AND token = '/zpXSh2/bh8FbXtpd49oiu5k3nAFv6fluWrwlKJ2OhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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