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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dfaf293cac9609e3e6fc8826cdfeca2a85c5d428d2d366fbc317987a85b559' 
  AND token = 'g0kK8XOZP8KDafqr9OluS3YDK6btEYjd8fyII8oGklA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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