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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2414b0dae4cd04ad385069c4a645fa7e983d0f27be1440c8fef0b969aaacf58e' 
  AND token = 'PcSrr4zrIfKhCag3rkZOICBCTcpEMiZIVxDSxMf9IP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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