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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a817a945599eacb6accbafe03a5bc4c84921ccc21bddce88b8a78013898dddc2' 
  AND token = 'mG/pU4yWqkbV0IOwP7gdOHJBNKOBlnj9AeJW9daFl4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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