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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f493de7f0ae292d1adfbec51a91a81250241bca82343a6fde4d9d4842eef1e6' 
  AND token = 'VKGgqPbuok+emAwY3Z4N5vHKg9fTm3koeGDjupVNObA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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