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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1160c38aeb32460bbb0fc674a4e1e4311d9de0ad7b71d3bf1f280d8a52b62b' 
  AND token = '2ZbaDr1D2Wcy56+WtM0N0dQ+nOS0dSGU37TeczmbPCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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