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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8511c79b4135c4a4882a3ea36b9bcb4da0c697264a9eafecd701872d985990fc' 
  AND token = 'DrUAq3xVg7gTaaKffDvHbGnarJu8yrJ/AV3OXP7Dkxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00198

JSON explain

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