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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052be2086175c5bf32169bccdf83e77b9b2d4f3bf12b04dbb5ec38ada0bb909c' 
  AND token = 'tJCd20zw7F6ns3bOd5TGt15kLVj9BIxLykFa2jyLS8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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