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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e9018c7f14665cd19cd62bab70873702ff44830d4ba14b90c207e6c0e93a11' 
  AND token = 'T3Tzrk6bj/sI32e8fxS05zS2nC2u4dypRTPp5DLVmGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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