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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e60c347af19012d4788ac7fb1ed709eb60cd0cd05e1d4e669077436d497666' 
  AND token = 'lOCDvyckyaw/uMX+cQ+wx0RNDmoqM/ahRM/Jkd4i49Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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