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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340cbdb88d6792dd8b8b198cd8a7865c97ff438136e5d9d924cc45b142c8032c' 
  AND token = 'Chk9CTuB/nvrcirPu9BekPLAl5LZ2djGQXgW6OjoS+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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