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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae8c6e5a9b587054a641c7c24f05bccabe801afab25d7be6de3ee68866ec97f' 
  AND token = 'Mci7kI6daaqqFmT6Mdf1yyDJh8434OGeNU6eRQorbzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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