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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e9add3891289774d35746d56d347f963b5d0085ba10eb5a6644a00cb7ba656' 
  AND token = 'gDJeGlVsSAxwSZ/8Zo9mZPD7MQ1YsMtpCWUvtQi/Ctk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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