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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c9d0cd9f69c3ec528066bdc00e18b733724927405942e77a894b782e3fb2f6' 
  AND token = 'xziCARyw5s6suZ3o3VTXyIVe6CAg24eq6wlubGjkxo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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