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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbd36bd986ba5b51062e2ad06b3268f787a3cbaa1a5410d990e4da43b85b92c' 
  AND token = 'sDCyohv8Ka/b+KFW6lAhX4BezOU96HN/5/uKtCFXhno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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