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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f63952d4abb33b0df73285b434f45ab4c1065443767faae4dacaec36def4b0' 
  AND token = 'kaU+2BD+S0wNQgfItRMP9txv9vny7AfREyXCdKwprlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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