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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c700abcb38a66cb97993ed61d589e35cb9cba8059597e79e0e8f8a72368d911f' 
  AND token = '9Of+V8p9TYSt6MwFger8NS81ttVoIwSDma2eEtBnwHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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