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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906353f5970c7b039a74d5ab559677d408853d37294e0a4f9efb8a4a693e6ec9' 
  AND token = 'zg6CTx1O89dfSgvwd0cjlr6lX6ifLdrV4g0fcw0iFbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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