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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aafb50cd60fdaf56165adb77373718a0aec457e3e3b16894998a0da73851c09' 
  AND token = '1n9hp3qCw75EUYAKRdLkUoqLRZPna6p4zeRoSPd4Hyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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