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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5deafd59a51a9ee9345c3ea569752f9b8a57fe9a720e7fdb414f05660e8f7e' 
  AND token = 'gb2VswXQen2w6VyOLJ1cT0ve5uJbM91CLtBByE3OQ5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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