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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32e88db25c5e33c8018c148d39b111e9f97bae14da19ca3b12c0e6fcf855d1a' 
  AND token = 'zPUITHnte4r8xHZMg5ZL1r8U4MA67pYLwB2EzqH/FGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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