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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8c0b17eaf0aa4ee599636789e9b359764a86ddb1dd7c73db117d9ca8889b54' 
  AND token = 'Bc8HD+aMU8WP28lW5AojCOsTeSBTenk2X6LztNiF0TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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