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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b96cc8e3344ac8ace7329cd31d61683f676f77f3d3b5da00c9d7305ee95e693' 
  AND token = 'gogiEkzYtdoN9Y/pncijNyxVAFOuOc3OLJgPVpCmq6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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