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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40bddda31f2e4184c80fe0f6622887a06dc6295c71883db126c36900da1bbfe' 
  AND token = 'CZbbbtC5PQIqtxe1xO4oRNtIxJNAzMSoh0l4Y/muTxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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