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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a0366a5a1efd509331eb926e5bec1b38f43f7a9861a67e33baf82d467c2b6a' 
  AND token = 'UHgRkeT6ADj1zuYJ0JZK5gaawVpNlZFTVMQzyll4Mns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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