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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c9e2ea6a9e38df3f27ed01ab514b585060bbb70d07f44861f12beb3d9629ee' 
  AND token = '0Frzzxk6Ce85e3aXaCQOUicR27jPYj7oeLLDfm5hoD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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